What Thunderclap does is simple: It lets you connect your Facebook and Twitter accounts so it can post 1 super short message on your behalf the day we launch. Think of it as an "online flash mob".What exactly am I agreeing to when I authorize my Facebook or Twitter account?You’re allowing Thunderclap to share a single message on your behalf. This is only the case when you click the button on the campaign page to support with Twitter, Facebook, or Tumblr. After the campaign is complete, we won’t post any additional messages.